The MTA released a worst-case-scenario list of fare hikes yesterday, raising the threat of the $3 single ride and $105 30-day unlimited MetroCard.

The agency must raise about $670 million at the farebox to help close a $1.2 billion budget gap, unless state lawmakers agree to provide a bailout.

“The news is awful,” said Gene Russianoff of the Straphanger’s Campaign. “Riders can wind up paying a lot more for a lot less service.”

Other nightmare fares could include a $13 hike for the 14-day unlimited MetroCard to $60, increasing a seven-day unlimited pass to $32, and increasing the single-day unlimited pass to $9.50.

MTA-operated bridge tolls could also jump to $7. Yet while those astronomical fares are possible, they’re not probable, the agency said.

The numbers will likely decrease when the MTA releases its specific proposal next week, which will say exactly how much it plans to increase each type of fare.

The sky-high estimates give transit officials wiggle room in case the public or MTA board members convince them to change a certain fare, said MTA spokesman Jeremy Soffin.

“By putting in a high ceiling, we leave in the possibility for any number of combinations” of increases, he said.

The schedule for eight separate public hearings was also released with the estimates.

Straphangers can sound off in any of the five boroughs and three outlying counties, beginning Jan. 14 in the Trianon Ballroom at the Hilton New York on Sixth Avenue at 6 p.m.

Fare hikes won’t take effect until June, officials said. Drastic service cuts meant to close the budget gap, like eliminating some subway and bus lines, wouldn’t begin until after March.

Other maxed-out increases include raising paratransit fares – such as for Access-a-Ride – 300 percent, to $6, and making bonuses available only to riders who put as much as $12.50 on their MetroCard, a $5.50 increase.

Also, Long Island bus service could increase to $3.50 for single-ride cash fare, and paratransit service would hike to $7 per ride.

Albany is deliberating over the fate of the MTA while straphangers fear for their wallets.

Lawmakers are trying to work out a plan to save the agency, said Assemblyman Richard Brodsky, whose committee oversees the MTA.

“The growing consensus is that we can’t let the MTA implode on its own,” he said.

Earlier this month, former MTA Chairman Richard Ravitch proposed tolling the now-free East and Harlem river bridges and implementing a payroll tax to fund mass transit.